Is it possible to play music during calls so that the partner can hear it ? Android

Question

I\'m trying to make and app like Call Cheater(Originally developed for Symbian OS)

Is it possible to play a music during a phone conversation where receiver and call

Answer 1

Note: You can play back the audio data only to the standard output device.
Currently, that is the mobile device speaker or a Bluetooth headset. You 
cannot play sound files in the conversation audio during a call.

See official link 

http://developer.android.com/guide/topics/media/mediaplayer.html